#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
using namespace std;

int main()
{
	int n;
	string s;
	cin >> n;
	if (n % 2 == 0)
	{
		for (int i = 0; i < n / 2; i++)
		{
			s += "1";
		}
	}
	else
	{
		s += "7";
		for (int i = 0; i < (n - 3) / 2; i++)
		{
			s += "1";
		}
	}
	cout << s << endl;
	return 0;
}